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Power Flow
1
General Information 2nd Ed. 02/07 FSO-2405
1st Speed
FSO-2405/89
The transmission must efficiently transfer the engine’s power or torque to the vehicle’s driveline.
It is essential to know what takes place in the transmission during torque transfer when
troubleshooting or making repairs.
1st, 2nd and 3rd Speeds
1. Torque from the engine is transferred to the transmission’s input shaft.
2. The torque is transferred to the countershaft drive gear. In this way, input shaft and
countershaft allways run together.
3. The torque along the countershaft is delivered to all mainshaft gears assembled on bearings.
These gears rotate free unless one gear is shifted.
4. When a gear is shifted, the torque is transferred from the corresponding engaged mainshaft
gear, through the clutching teeth of the synchronizer assembly, to the mainshaft. Torque is,
then, delivered along the mainshaft to the driveline components through output yoke.
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